"凭什么"是一个口语里常用的短语，表示不服气、觉得不公平。

"凭什么" is a commonly used phrase in spoken language that expresses dissatisfaction or a sense of unfairness.

当别人让你做你不想做的事时，你可以生气地说"凭什么？"

When someone asks you to do something you don't want to do, you can angrily say "凭什么？"